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Capital - Disclosure of Cash Flow Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]      
Cash flow from operating activities $ 796 $ 1,464 $ 877
Increase (decrease) in cash flow from operating activities (668)    
Change in non-cash working capital (38) (124) 316
Increase (decrease) in change in non-cash working capital 86    
Cash flow from operations before changes in working capital 758 1,340 1,193
Increase (decrease) in cash flow from operations before changes in working capital (582)    
Distributions paid to subsidiaries’ non-controlling interests (40) (223) (187)
Increase (decrease) in dividends paid to non controlling interests 183    
Property, plant and equipment expenditures (311) (875) (918)
Increase (decrease) in property, plant and equipment expenditure 564    
Net inflows (outflows) of cash 284 133  
Increase (decrease) in net inflows (outflows) of cash 151    
Committed syndicated bank facility | Committed credit facilities      
Disclosure of classes of share capital [line items]      
Undrawn borrowing capacity 1,500 1,400  
Common shares      
Disclosure of classes of share capital [line items]      
Dividends paid (71) (58) (54)
Increase (decrease) in dividends paid (13)    
Preferred shares      
Disclosure of classes of share capital [line items]      
Dividends paid (52) $ (51) $ (43)
Increase (decrease) in dividends paid $ (1)